The two multi-instance segmentation metrics were used to assess the performance of the models. Multiple Instance Dice Similarity Coefficient (MI_DSC) and Multiple Instance Normalized Surface Dice (MI_NSD).
The DSC [1]} is defined as the harmonic mean of precision and recall:
\(DSC (Y, \hat{Y}) := \frac{2 \mid Y \cap \hat{Y} \mid }{\mid Y \mid + \mid \hat{Y} \mid },\) 
